Directly preload all image-preview thumbnails together with the default thumbnails, in order to reduce wait time between images when watching them

- fix regression introduced in  d566b0a1
- Directly update image when image preview is enabled

Use "thunar_file_request_thumbnail" instead of directly using the thumbnailer, like it is done for other thumbnail requests.

Like that the thumbnail will be updated on file changes (amoung other minor advantages)

Fixes #949

MR !418

- accumulate requests for 100ms, only than queue the job
- rely on 'Ready' signal again to draw thumbnails

MR !416

- Each ThunarFile takes care on it's own thumbnail requests itself
- Loading is triggered by icon-renderer
- Simplified logic of THUNAR_FILE_THUMB_STATE
- Dont call file_reload after the thumbnail got loaded. Instead, only redraw the window

MR !416
Fixes #1237

Co-authored-by: Amrit Borah <elessar1802@gmail.com>

- (Risk of beeing executed after the 'REQUEST_FINISHED' signal arrived)
- make use of the correct thumbnail size instead of 'thumbnailer->thumbnail_size' which is just the default

Before at startup it was possible to have 0 as request_id if proxy state is THUNAR_THUMBNAILER_PROXY_WAITING, resulting in the requester not beeing able to properly process the "request-finished" signal.

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Gaël Bonithon authored 1 year ago and Alexander Schwinn committed 1 year ago

MR !417

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And make use of it for "metadata::emblems"

Fixes #892

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