Created attachment 188457 [details] Trail of an old cursor alongside the actual cursor Description: While typing text in LibreOffice, sometimes a trail remains. This is mostly visible when using bidirectional text while dark mode is activated. Steps to Reproduce: 1. Type something in English or other language that is written from left to right like 'English'. 2. Then type something in Arabic/Persian, or other language that is written from right to left, like 'فارسی'. 3. Wait until the directional blinking cursor hides for a second or less as it blinks. 4. Be fast and move the cursor with arrow keys left or right. Actual Results: Trail of the cursor remains in the old place. This sometimes happen even when you type in a single language, but it is easier to reproduce with multiple directions. Expected Results: No trail of the cursor should remain in the old place. Reproducible: Always User Profile Reset: No Additional Info: Version: 24.2.0.0.alpha0+ (X86_64) / LibreOffice Community Build ID: bb01ef3865c406f322d6e656faba2191aaeeb6da CPU threads: 20; OS: Windows 10.0 Build 22621; UI render: Skia/Vulkan; VCL: win Locale: en-US (en_DE); UI: en-US Calc: CL threaded
I think the problem comes from XOR rendering as discussed below: tdf#38844 - Reduce XOR rendering (search RasterOp::Xor) https://bugs.documentfoundation.org/show_bug.cgi?id=38844 A similar (fixed) bug on direct cursor leaving trail: tdf#122970 - Direct cursor leaves screen trail with mouse pointer movement and no text https://bugs.documentfoundation.org/show_bug.cgi?id=122970 Therefore, I set this issue as a blocker for tdf#38844.
(In reply to Hossein from comment #1) > Therefore, I set this issue as a blocker for tdf#38844. Shouldn't this be a "depends" rather than a "blocks"? Does it happen with Skia/Raster? No repro in: Version: 24.2.0.0.alpha0+ (X86_64) / LibreOffice Community Build ID: 77fca616e0bd79e0b405fd0b3543cf8e94e15df3 CPU threads: 8; OS: Linux 5.15; UI render: default; VCL: gtk3 Locale: en-AU (en_AU.UTF-8); UI: en-US Calc: CL threaded
(In reply to Stéphane Guillou (stragu) from comment #2) > (In reply to Hossein from comment #1) > > Therefore, I set this issue as a blocker for tdf#38844. > > Shouldn't this be a "depends" rather than a "blocks"? I think it should be "blocks", as the above issue is something like a meta issue rather than a specific bug. In every instance of XOR, you have to look into details and find an alternative implementation. > Does it happen with Skia/Raster? > > No repro in: > > Version: 24.2.0.0.alpha0+ (X86_64) / LibreOffice Community > Build ID: 77fca616e0bd79e0b405fd0b3543cf8e94e15df3 > CPU threads: 8; OS: Linux 5.15; UI render: default; VCL: gtk3 > Locale: en-AU (en_AU.UTF-8); UI: en-US > Calc: CL threaded Not reproducible with any of these (x11 on Linux) X11 on Linux without Skia: Version: 24.2.0.0.alpha0+ (X86_64) / LibreOffice Community Build ID: bb01ef3865c406f322d6e656faba2191aaeeb6da CPU threads: 12; OS: Linux 5.19; UI render: default; VCL: x11 Locale: en-US (en_US.UTF-8); UI: en-US Calc: CL threaded X11 on Linux with Skia/hardware: Version: 24.2.0.0.alpha0+ (X86_64) / LibreOffice Community Build ID: bb01ef3865c406f322d6e656faba2191aaeeb6da CPU threads: 12; OS: Linux 5.19; UI render: Skia/Vulkan; VCL: x11 Locale: en-US (en_US.UTF-8); UI: en-US Calc: CL threaded X11 on Linux with Skia/software: Version: 24.2.0.0.alpha0+ (X86_64) / LibreOffice Community Build ID: bb01ef3865c406f322d6e656faba2191aaeeb6da CPU threads: 12; OS: Linux 5.19; UI render: Skia/Raster; VCL: x11 Locale: en-US (en_US.UTF-8); UI: en-US Calc: CL threaded Also not reproducible with gtk3 on Linux: Version: 24.2.0.0.alpha0+ (X86_64) / LibreOffice Community Build ID: bb01ef3865c406f322d6e656faba2191aaeeb6da CPU threads: 12; OS: Linux 5.19; UI render: default; VCL: gtk3 Locale: en-US (en_US.UTF-8); UI: en-US Calc: CL threaded Can be a Windows-specific problem.
> Does it happen with Skia/Raster? Reproducible on Windows with Skia/Hardware: Version: 24.2.0.0.alpha0+ (X86_64) / LibreOffice Community Build ID: bb01ef3865c406f322d6e656faba2191aaeeb6da CPU threads: 20; OS: Windows 10.0 Build 22621; UI render: Skia/Vulkan; VCL: win Locale: en-US (en_DE); UI: en-US Calc: CL threaded Not reproducible on Windows with Skia/Software: Version: 24.2.0.0.alpha0+ (X86_64) / LibreOffice Community Build ID: bb01ef3865c406f322d6e656faba2191aaeeb6da CPU threads: 20; OS: Windows 10.0 Build 22621; UI render: Skia/Raster; VCL: win Locale: en-US (en_DE); UI: en-US Calc: CL threaded Also not reproducible on Windows without Skia: Version: 24.2.0.0.alpha0+ (X86_64) / LibreOffice Community Build ID: bb01ef3865c406f322d6e656faba2191aaeeb6da CPU threads: 20; OS: Windows 10.0 Build 22621; UI render: default; VCL: win Locale: en-US (en_DE); UI: en-US Calc: CL threaded So, it happens only on Windows with Skia/Vulkan hardware rendering.
(In reply to Hossein from comment #3) > I think it should be "blocks", as the above issue is something like a meta > issue rather than a specific bug. In every instance of XOR, you have to look > into details and find an alternative implementation. Makes sense! (In reply to Hossein from comment #4) > So, it happens only on Windows with Skia/Vulkan hardware rendering. Thanks for testing!
No repro in Version: 24.2.0.0.alpha0+ (X86_64) / LibreOffice Community Build ID: fcbae818b793a9ee97a1b5ddc53902be7a2376f5 CPU threads: 8; OS: Windows 10.0 Build 19043; UI render: Skia/Vulkan; VCL: win Locale: ru-RU (ru_RU); UI: ru-RU Calc: threaded I have intel i7-10510U CPU here with integral graphic card
(In reply to Roman Kuznetsov from comment #6) > No repro in > > Version: 24.2.0.0.alpha0+ (X86_64) / LibreOffice Community > Build ID: fcbae818b793a9ee97a1b5ddc53902be7a2376f5 > CPU threads: 8; OS: Windows 10.0 Build 19043; UI render: Skia/Vulkan; VCL: > win > Locale: ru-RU (ru_RU); UI: ru-RU > Calc: threaded > > I have intel i7-10510U CPU here with integral graphic card The problem is better visible with large size text. Please try navigating through the document in attachment 183604 [details].
Created attachment 190367 [details] Cursor trail in Writer on macOS I'm seeing this in LO 7.6.2.1 on an Intel Mac with Skia enabled. No need for dark mode or bidirectional text. A vertical mark is left consistently at every character past a certain point in the window. To the left of said point there is either no trail or the trail is a row of tiny dots (depending on the font I guess). I suppose this has to do with my system somehow because otherwise I would expect there to be a lot of noise about the issue.