Long delay to show CopyQ notification when copying 0.5MB of text to clipboard

[Gitoffthelawn]

Describe the bug
When copying 0.5MB of text to the clipboard there is a long 10-20 second delay (depending on processor speed) to display the CopyQ notification.

To Reproduce
Steps to reproduce the behavior:

1. Open any text editor
2. Create a 500KB (0.5MB) text file
3. Copy the contents of the text file to the clipboard
4. Notice that it takes CopyQ 10-20 seconds to respond with its notification

Expected behavior
The notification to appear momentarily after the copy operation is performed.

Screenshots
N/A

Version, OS and Environment
(From copyq version)

• CopyQ Clipboard Manager v3.13.0
• Qt: 5.13.2
• Compiler: GCC
• Arch: i386-little_endian-ilp32
• OS: Windows 7 SP 1 (6.1)

Additional context
I experimented quite a bit turning off different CopyQ settings/features that I thought may be increasing the delay, but nothing I changed resulting in the notification displaying quickly after the copy operation was performed.

[hluk]

Is this happening only when copying text from a specific text editor?

Any warning or error in logs (F12 shortcut from the main window)?

[Gitoffthelawn]

I'll test this in v4.0, and provide updates for you.

IIRC, I'm 99% sure it's from every text editor I tried, but I'll double-check to be 100% sure.

I'll also check the logs in v4.0 and let you know.

[Gitoffthelawn]

Depends on #1623