If a search returns no results, then "No results found for ..." should be shown and navigation should go back to searching with suggestions.
Give user the option to start where they left off or from the start or from the start.
Add grid-view when thumbnails are visible.
Add scrollbar.
Add option to scale image to window size.
Somehow deal with youtube banning ip when searching too often.
Optimize shadow rendering for items (Right now they fill too much space that is behind items). It should also be a blurry shadow.
When continuing to read manga from a different page from the first and there is no cache for the chapter, then start downloading from the current page instead of page 1.
Show progress of manga in the history tab (current chapter out of total chapters).
Animate page navigation.
Properly format text in items. For example for 4chan. The size of the item should also change.
Add greentext support for quotes.
Add support for special formatting for posts by admins on imageboards.
For image boards, track (You)'s and show notification when somebody replies to your post.
Go to next chapter when reaching the end of the chapter in image endless mode.
Some text is not visible on 4chan, such as code blocks.
Show indication when search is in progress (or when something is loading). Some sites such as youtube and mangadex are slow at searching.
Add login page for mangadex instead of having to manually add remember_me token to config file.
Allow deleting watch history with delete key (and show confirmation).
Add pagination to nyaa.si results.
Add navigation to nyaa.si submitter torrents.
Create a large texture and add downloaded images to it. This will save memory usage because sfml has to use power of two textures (and so does opengl internally) for textures, so if you have multiple textures they will use more memory than one large texture with the same texture data.
Use fallback cjk font for regular sf::Text as well (search, tabs, chapter name when viewing a page, path in file-manager, etc).
Fix some japanese fonts not rendering (full width alphanumeric?).
Also add support for full chinese and korean range.
Resize text vertex arrays to 0 when not visible on screen to reduce memory usage. Text already does this but its done incorrectly (copied from dchat codebase). (Is this really necessary?).
Speed up thumbnail creating (image resizing).
Extract thumbnail from images that are being downloaded, while its downloading and show that while the full image is downloading (upscaled, or with blurhash).
Use one special thread to load cached files. Right now if there are multiple images on the screen and 1 needs to download while the others are cached, then the cached images wont load until that 1 image has downloaded.
Press pgup/pgdown to scroll and entire page.
Press home/end to scroll to top/bottom.