Open Bug 1669263 Opened 4 years ago Updated 4 years ago

Sometimes, tab-modal Print Preview briefly flashes a higher-zoom version of the document, when you've made a small change to a print setting

Categories

(Core :: Print Preview, task)

Product:
Core
Component:
Print Preview
Type:
task

Tracking

()

People

(Reporter: dholbert, Unassigned)

Details

(Whiteboard: [print2020])

(I reproduced this earlier today, though I can't reproduce at the moment. So I don't have great STR / screencast at the moment.)

Approximate STR:

  1. Ctrl+P to start a print operation
  2. Change the print settings in a way that doesn't really impact the rendering. E.g.:
  • Change the page range "end" to 1 fewer than the total number of pages
  • Change the custom margin to 0.51 instead of 0.5

EXPECTED RESULTS:
No jarring flash/jump in the content.

ACTUAL RESULTS:
When this bug happens, I see a very brief paint of much-larger content, and then we paint the content at its correct size again.

I'm not sure what's going on. Working theory: I think we do two reflows, where the first one is to find out the page size so we can compute the zoom factor, and then there's a second fast incremental reflow that applies the zoom factor; and maybe this jarring larger paint is somehow getting scheduled between those two reflows? If so, we should try to prevent a paint from happening at that point, probably.

(I'm also not sure why I was able to reproduce this reliably earlier today and now cannot. I haven't installed any updates; it might be due to system load, or the particular page that I was previewing, or other factors.)

Summary: Sometimes, tab-modal Print Preview briefly flashes a larger version of the document, when you've changed a setting → Sometimes, tab-modal Print Preview briefly flashes a higher-zoom version of the document, when you've made a small change to a print setting
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