Draging gtk.Paned handle causes excessive redraws of child vte widgets

[dorphichinfa]

When resizing a window, or when resizing a terminal in a window (such as by its adjacent dividers) all the affected terminals flicker. I should note that I'm currently using Compiz and Terminator with a partially transparent background. Not sure if the problem is specific to this configuration.

It's like when it receives the resize instruction, it takes three steps:
 * Blank out the entire window with black. (my background colour)
 * Make that black transparent. (according to my configuration)
 * Than draw on top the terminal contents.

These three things occur rapidly and repeatedly as the terminal is resized.

It could be worth noting that the flicker doesn't occur with every pixel of resize, but only when the terminal gains or loses a column or row.

Yeah... it's quite annoying. It would be nice if Terminator could perform resizes for transparent terminals more gracefully.

[Thomas Hurst (tom.hurst)]

Deos gnome-terminal behave the same way? This is probably a VTE issue.

[Thomas Hurst (tom.hurst)]

This might be related to #190946. Does it still happen with trunk?

[Chris Jones (cmsj)]

I think this is just the vte widgets redrawing as they receive resize events.
One possible solution would be to replace the widgets with coloured boxes during resize events, but this would need careful thought and possibly extending gtk.Paned.

I'm happy to be proven wrong though :)

[chantra (chantra)]

I checked on this one again and this is pretty tough to tackle...

The fact that resizing event is sent, all the terminals will redraw and as Schalken said, it wipes everything and redraw on top.
Every terminal emulator I tried has the same issue, e.g. gnome-terminal, xterm.

I think we could work around by handling the resize event and drop a few screen refresh, but I do not see how we could find out when the resizing ends...

[Chris Jones (cmsj)]

I'm pretty sure this is impossible without extending Paned to not send resize events until the end of a handle drag.

[Stephen Boddy (stephen-j-boddy)]

Fairly certain we can close this since rev 1220 was merged in (deferring the resizes into the idle loop) and released with 0.96. At least for me this is buttery smooth now :-)
I'll set to Fix Released, and if anyone objects, just reopen it.