Test system Ubuntu 18.04.1 (AMD64), LO 220.127.116.11 RC1 (GTK3)
1 - Open any Impress file
2 - Ensure that the 'Mouse Pointer as Pen' option is enabled for this file.
3 - Start the slide presentation
4 - use the PEN to add some INK to the page
5 - Without leaving presentation mode use the context menu to remove all ink from the slide.
6 - End presentation mode and notice that no ink has been left on the slide (none shown in preview mode)
7 - Enter presentation mode again
8 - Use the PEN cursor to add some ink again
9 - End the presentation mode (notice that the ink is now displayed on the preview for this slide)
10 - Enter presentation mode again
11 - Using the context menu again remove all ink from this slide
12 - Exit presentation mode
The ink is till displayed on the slide preview, if the slide is opened for presentation mode the ink will be displayed, if the file is saved at this point or forward the ink will be saved on the slide. There appears to be no way at this point to remove the ink from that slide.
not a solution for this bug, but a workaround could be the enhancement that I just submitted with Bug 122732 : adding an eraser option in the right click menu during a slide show
Build ID: 7c7a4675ad5d61add70dd073f680ea37012962ce
CPU threads: 4; OS: Linux 4.15; UI render: default; VCL: gtk3;
Locale: ca-ES (ca_ES.UTF-8); UI-Language: en-US
Build ID: 3ca42d8d51174010d5e8a32b96e9b4c0b3730a53
Threads 4; Ver: 4.15; Render: default;
but not in
Version 18.104.22.168.alpha0+ (Build ID: efca6f15609322f62a35619619a6d5fe5c9bd5a)