[Libreoffice-bugs] [Bug 117829] VIEWING: Text flickers in text box when moving mouse in and out of it while it is not selected dependent on OpenGL video hardware acceleration setting

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=117829

V Stuart Foote <vstuart.foote at utsa.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |michael.meeks at collabora.com
                   |                            |, quikee at gmail.com,
                   |                            |vmiklos at collabora.com
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1
           See Also|                            |https://bugs.documentfounda
                   |                            |tion.org/show_bug.cgi?id=96
                   |                            |500,
                   |                            |https://bugs.documentfounda
                   |                            |tion.org/show_bug.cgi?id=11
                   |                            |8856,
                   |                            |https://bugs.documentfounda
                   |                            |tion.org/show_bug.cgi?id=11
                   |                            |3714

--- Comment #12 from V Stuart Foote <vstuart.foote at utsa.edu> ---
Confirmed on Windows 10 Home 64-bit en-US (1809) with
Version: 6.4.0.0.alpha0+ (x64)
Build ID: 87238627b025ee6aa61378667e56b1769d4460c2
CPU threads: 4; OS: Windows 10.0; UI render: default; VCL: win; 
TinderBox: Win-x86_64 at 42, Branch:master, Time: 2019-06-09_03:04:32
Locale: en-US (en_US); UI-Language: en-US
Calc: threaded

Setting rendering to default (Tools -> Options -> View unchecking Use OpenGL)
opening this Base document, and selecting Form1 which opens into Form edit
view.

On mouse over of the Text box its text will flicker, as will entering the Text
box and scrolling the text, as will selection of the text.

This is a rendering issue in refreshing the canvas, seems the same as bug
118856 for the Help -> About dialog. And the similar form design mode bug 96500

For bug 113714 issue with Main menu, Miklos fixed that [1] adjusting from
direct RenderContext to use a buffer--effectively double buffered.

IIUC OpenGL and GTK3 rendering already does the double buffering, so they are
not affected. 

Enabling OpenGL rendering (and verifying it took) the "flicker" will vanish--on
the Base Form1 view, and on the Help -> About dialog.

=-ref-=
[1] https://gerrit.libreoffice.org/#/c/72610/

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