Created attachment 130734 [details]
Screen before placeholder removal

Created attachment 130735 [details]
Screen after placeholder removal

Please attach an example document with the situation before removing the placeholder.

Set to NEEDINFO.
Change back to UNCONFIRMED after you have provided the document.

Actually, one does not even need a placeholder. It happens with any font with very long underlengths. 

Unfortunately, the font I use is proprietary, therefor, I can't attach it. Does anyone know a free font with very long underlengths?

(In reply to Patrick Schönbach from comment #4)
> Unfortunately, the font I use is proprietary, therefor, I can't attach it.
> Does anyone know a free font with very long underlengths?

Maybe this: http://www.fontspace.com/jonathan-s-harris/signatures
Here is the promising category: http://www.fontspace.com/category/thin,tall

Could you please test, if you can reproduce the problem with some of those free ones?

Got it. Do the following:

1. Install the attached font "Signatures".

2. Open an empty Writer document.

3. Select font "Signatures", point size 32.

4. Type "gggggggggggg" -> LOWER PART OF LETTERS IS NOT DRAWN.

5. Prees Backspace -> LOWER PART OF LETTERS IS NOT ERASED.

Created attachment 130877 [details]
Test font "Signatures"

(In reply to Patrick Schönbach from comment #6)
> Got it. Do the following:
> 
> 1. Install the attached font "Signatures".
> 
> 2. Open an empty Writer document.
> 
> 3. Select font "Signatures", point size 32.
> 
> 4. Type "gggggggggggg" -> LOWER PART OF LETTERS IS NOT DRAWN.
> 
> 5. Prees Backspace -> LOWER PART OF LETTERS IS NOT ERASED.

Ok, I can reproduce. Step 5. depends on zoom level. Also, the problems disappear after you zoom out or in.

No problem in version 3.6.7.2

Arch Linux 64-bit, KDE Plasma 5
Version: 5.4.0.0.alpha0+
Build ID: b12823aa81003e80372bd89db79bd6ba8e032a95
CPU Threads: 8; OS Version: Linux 4.9; UI Render: default; VCL: kde4; 
Locale: fi-FI (fi_FI.UTF-8); Calc: group
Built on February 1st 2016

Arch Linux 64-bit, KDE Plasma 5
Version: 5.2.5.1
Build ID: 5.2.5-1
CPU Threads: 8; OS Version: Linux 4.9; UI Render: default; VCL: kde4; 
Locale: fi-FI (fi_FI.UTF-8); Calc: group

Created attachment 132038 [details]
metrics for the Signatures font used for test font

@Khaled, * 

So metrics for the test font here have the WinDescent set different than the hhea Descender and we look to be clipping to the hhea Descender on text entry. 

And, if I set the hhea Descender to match the WinDescent value the glyphs are fully formed on entry to canvas and when rubbed out with back space.

So this is just bad font metrics, right?

But then what is happening when zooming in or out to refresh the canvas? Why are the full glyphs showing on canvas--are different metrics (WinAscent/WinDescent rather than the hhea values) in use when zooming than when entering text?

Was testing on Windows 10 Pro 64-bit en-US with
Version: 5.4.0.0.alpha0+
Build ID: f2efe33f71a8c092a19e3a27a85ac9057ebdca64
CPU threads: 8; OS: Windows 6.19; UI render: GL; 
TinderBox: Win-x86@42, Branch:master, Time: 2017-03-18_00:11:52
Locale: en-US (en_US); Calc: CL

and with attachment 130877 [details] test font "Signatures" installed. The screen clip of its font metrics was with Type light (ver 3.2.037) freeware.

=-ref-=
http://cr8software.net/typelight.html

I don’t know for sure, but probably we are wrongly clipping on the typographic metrics rather than the clipping ones. Is this Windows/OpenGL only issue?

(In reply to Khaled Hosny from comment #11)
> I don’t know for sure, but probably we are wrongly clipping on the
> typographic metrics rather than the clipping ones. Is this Windows/OpenGL
> only issue?

I have only checked on Windows builds thus far, but it behaves the same on canvas with OpenGL, and Default and also without GPU acceleration.

In initial QA confirmation @Buovjaga did show it as affecting Linux builds with default rendering.

Still present in version 6.0.2.1

Windows 5.3 repo blames https://cgit.freedesktop.org/libreoffice/core/commit/?id=34d7602954d4483b3bc9db700e7df2c15348947a

tdf#55469 Consistent line spacing across platforms

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