Notes:

• when trying to drag-and-drop a request to block it the Request Details section is displayed on mouse click-down instead of click-release;
  The problem is when the browser size/width causes the Details section to overlap the requests thus making the Drag-to-Block scenario harder;
• as Harald/Kriyszig iterated in bug 1596091, there would be some benefits; but the main issue would be with the panels adjusted for decreased available space;

Affected versions

• 78.0b6, 79.0a1

Affected platforms

• macOS 10.15.5, Ubuntu 20, Windows 10

Steps to reproduce

1. Launch Firefox, enable DevTools and access any webpage;
2. Enable the Request blocking tab;
3. Click on any network request from the list;
4. Grab the browser and shrink width until the [Request Details] section is collapsed;
5. Click on the [Hide Request Details] button;
6. Click and hold over any request from the list;
7. Try to drag and drop it in the Blocking section;

Enhancement suggestion

• Request details section is not displayed;

Actual result

• Request Details section is displayed covering up the requests list;

Regression range

• not a regression, visible after implementation for bug 1596091

Additional notes

• attached recording with what's the problematic scenario

I see. During my testing I used three windows side by side so I didn't run into this problem
I noticed this happens for aggressively small (in terms of height) window with 3 panes open.

Indeed hiding network details panel on DragStart event seems like a good solution because Click is almost always, if notalways fired before a DragStart event.

@Honza how do you think we should approach this problem?

(In reply to Kriyszig from comment #1)

Indeed hiding network details panel on DragStart event seems like a good solution because Click is almost always, if notalways fired before a DragStart event.

@Honza how do you think we should approach this problem?

I agree that hiding the Details panel is probably the best we can do.
Thanks for pointing that out!

Honza