fix(QtDriver): redundant search override

[career-yashaswee]

fix(QtDriver): redundant search override

Description:

This pull request addresses an issue where the filter_items function was being called unnecessarily in the QtDriver class. This function filters assets based on a search term.

Expected Behavior:

When the user enters a search term and clicks the search button or presses Enter:
If the search term hasn't changed (i.e., it's the same as the previous search), filter_items shouldn't be called again.
This check should be bypassed during window initialisation to ensure all assets are initially visible.

Previous Behavior:
filter_items was called regardless of whether the search term had changed, leading to redundant filtering.

Changes Introduced:
A new variable, previous_search_string, is introduced.
When the user performs a search:previous_search_string is set to the current search term.

Before calling filter_items:
The code checks if previous_search_string is the same as the current search term.
If they are the same and the window is not initializing, filter_itemsis skipped.
An override flag is added for functions that call filter_items during window initialisation to bypass the check and ensure all assets are displayed.

Benefits:

• Improves performance by avoiding unnecessary filtering.
• Enhances user experience by preventing redundant filtering actions.

Testing:
Manual testing has been conducted to ensure the fix functions as intended.

• Additional unit tests can be added to further solidify the fix.

Please review the code changes and provide feedback.

[yedpodtrzitko]

While you're touching the code already, it could be worth to flip this condition as well. There's no else: block, so instead of this:

if self.lib:
    # all the code

it could be done as this:

if not self.lib:
    return

# the same code except it's less indented now and you dont have to scroll 50 lines to see what will happen (spoiler: nothing) if the condition `if self.lib:` is not fulfilled 

[YoyloNerd]

You also fully broke some stuff from the main branch when merging that affects search