https://bugs.documentfoundation.org/show_bug.cgi?id=163945

--- Comment #33 from Seb <[email protected]> ---
I have some new information, but the various issues are getting a bit mixed up
so let me clarify what I see on my machine. All of this is with skia/metal
except where stated.

** Issue A: When resizing a column by dragging, the vertical line position does
not keep up (left hand side of video in comment#1).

 - status: seems fixed in nightlies, I think by
https://bugs.documentfoundation.org/show_bug.cgi?id=163945. Resolved.

** Issue B: When resizing a column by dragging, the "Width: xxx" tooltip
flickers or disappears

  - In 24.8.3.2, my tooltip is 'dimmed' by flickering when dragging at modest
speed. i.e. a good fraction of the frames are drawn without the tooltip. You
can see this clearly on the video I am about to upload, by stepping through the
video frames: many show the window rendered without the tooltip.

  - In 24.8.3.2 with skia software rendering, the tooltip is pretty stable but
not perfect - every so often there is a glitch frame where it is not drawn.
Visible on video.

  - In 2024-11-23 nightly, there are similar 'no tooltip frames' at low
dragging speed. But at faster (but still reasonable) speeds, the tooltip
disappears completely.

 - summary: The complete disappearance of the tooltip at faster drag speed is a
regression. But Issue B is pretty minor TBH, I kind of expect tooltips to be
glitchy :) 


** Issue C: When dragging to make a cell selection in Calc, the block of cells
that is highlighted does not refresh frequently enough to keep up with the
pointer **when View->Headers is enabled**.

   - 2024-11-23 nightly: Occurs with skia/metal **but only when View->Headers**
is enabled. When resizing the selection, the column/row headers that contain
the selection are also highlighted. These header highlights refresh much faster
than the cells themselves, but they do slightly lag behind the pointer (when
compared to 24.8.3.2), as if they are only just able to keep up. My theory is
that LO is spending too much time rendering the headers to have time to render
the cell highlights.

   - 24.8.3.2: **does not occur** (even with skia/metal and Headers). So this
one is in fact a regression.


** Issue D: In Impress, when dragging a selection box on an empty background,
the selection box does not keep up with the pointer, and does not refresh at
all if the pointer is moving quickly **when View->Status Bar is enabled**.


  - 2024-11-23 nightly, this only happens if the Status Bar is visible. I think
the rapid redrawing of the selection size in the status bar is preventing the
selection box from redrawing. Only happens with metal.

  - 24.8.3.2: same.


** Issue E: In Writer, when dragging to make a text selection, the selected
text highlight does not keep up with the pointer.

    - Only occurs in Nightly (not 24.8.3.2), so this is regression
    - Still occurs with all toolbars and status bars and ruler disabled (only
the document visible)


Common themes:
  - seems like refreshing the Column/Row headers and/or status bar is is (a)
slow/glitchy and (b) inhibiting refresh of the main selection. The exception
seems to be Issue E (Writer) where it happens even with nothing visible except
the document.

I will upload videos of most of these cases as they are quite informative to
study.

Also want to say I am a developer (on other platforms) so if it would be very
helpful for me to run profiling or try out speculative changes before they hit
master then I could get set up to do that.

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