Upload dialog has empty areas when the changeset doesn't include all of add/modify/delete operations

[avar]

When uploading a changeset there's an area of the upload dialog reserved for add/modify/delete operations. It used to be the case that if you didn't have all of these the remaining operations would expand to fill the empty area. But not anymore.

See attached screenshots.

[avar]

Only modify operations. Empty area on both sides

[avar]

Add/modify operations. Delete area still empty

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The dialog only looks normal when it has add/modify/delete operations

[Gubaer]

(In [2045]) fixed #3386: Upload dialog has empty areas when the changeset doesn't include all of add/modify/delete operations

[avar]

Reopening. Thus bug is happening on r2532 in a different manner than before. Now it's the changeset area that's expanding to fill the dialog sometimes instead of the uploaded object.

1. Open JOSM
2. Make changes by only adding objects
3. Open upload dialog
4. Resize the dialog, you may have to do this a few times, usually happens after 1-5 times
5. Changeset area expands to take up the space modified/deleted objects would normally take

Instead of #5 the area with the added objects should always take up the remaining space.

[avar]

Opening upload dialog on r2532

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Upload dialog after resizing on r2532

[Gubaer]

(In [2599]) fixed #4130: Chunked upload mode counter is wrong
fixed #4118: Upload dialog too complicated
fixed #4129: Hide the new "Upload data in one request/chunks/individually" behind an expanding "Upload method" box
fixed #2075: API 0.6: don't upload more than 50K edits at once
fixed #4044: Huge uploads never end [should be solved with chunked upload mode]
fixed #4110: Upload dialog spacing wrong
fixed #3386: Upload dialog has empty areas when the changeset doesn't include all of add/modify/delete operations
see #3369: bulk import helper [JOSM now supports multi changesets uploads]

See online help for more details.

Completes r2598