fix: Delay setting image if an algorithm is still running

[Czaki]

This PR solves the bug of setting a new image to already running ROI Extraction algorithm.

fix PARTSEG-K3

[deprecated-napari-hub-preview-bot]

Preview page for your plugin is ready here:
https://preview.napari-hub.org/4DNucleome/PartSeg/627
Updated at: 05/11/2022 , 11:37:26

[codecov]

Codecov Report

Merging #627 (fb9eab3) into develop (9caf476) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #627      +/-   ##
===========================================
+ Coverage    81.52%   81.54%   +0.01%     
===========================================
  Files          143      143              
  Lines        19120    19140      +20     
===========================================
+ Hits         15588    15608      +20     
  Misses        3532     3532              

Impacted Files	Coverage Δ
...kage/PartSeg/common_backend/segmentation_thread.py	100.00% <100.00%> (ø)
...ckage/PartSeg/common_gui/algorithms_description.py	80.53% <100.00%> (ø)

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[sourcery-ai]

Sourcery Code Quality Report

✅  Merging this PR will increase code quality in the affected files by 0.07%.

Quality metrics	Before	After	Change
Complexity	2.23 ⭐	2.22 ⭐	-0.01 👍
Method Length	48.27 ⭐	48.57 ⭐	0.30 👎
Working memory	5.86 ⭐	5.84 ⭐	-0.02 👍
Quality	78.06% ⭐	78.13% ⭐	0.07% 👍

Other metrics	Before	After	Change
Lines	1465	1517	52

Changed files	Quality Before	Quality After	Quality Change
package/PartSeg/common_backend/segmentation_thread.py	84.64% ⭐	83.75% ⭐	-0.89% 👎
package/PartSeg/common_gui/algorithms_description.py	78.22% ⭐	78.22% ⭐	0.00%
package/tests/test_PartSeg/test_common_backend.py	77.22% ⭐	77.28% ⭐	0.06% 👍

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
package/PartSeg/common_gui/algorithms_description.py	FormWidget._add_to_layout	12 🙂	199 😞	10 😞	46.98% 😞	Try splitting into smaller methods. Extract out complex expressions
package/tests/test_PartSeg/test_common_backend.py	TestBaseSettings.test_base_settings_history	0 ⭐	253 ⛔	10 😞	55.13% 🙂	Try splitting into smaller methods. Extract out complex expressions
package/tests/test_PartSeg/test_common_backend.py	TestExceptHook.test_my_excepthook	0 ⭐	266 ⛔	9 🙂	56.58% 🙂	Try splitting into smaller methods
package/tests/test_PartSeg/test_common_backend.py	TestBaseSettings.test_image_settings	0 ⭐	246 ⛔	9 🙂	57.54% 🙂	Try splitting into smaller methods
package/PartSeg/common_gui/algorithms_description.py	QtAlgorithmProperty._get_field_from_value_type	10 🙂	147 😞	6 ⭐	62.61% 🙂	Try splitting into smaller methods

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