## Issue
4644: Markdown Preview breaks when <iframe> is present
Error: "Invariant violation: could not find 'store' ..."
## Change
Until we figure out a way to pass the store to the SimpleMDE preview formatter, just replace the embed with a stub region.
## Issue
The previous code only handled the clamping if the FP is already floating when the main window is resized.
1. In fresh Odysee session, the floating player is always clipped on the right.
2. If you resize the desktop while not floating, the FP could be clipped when you go into floating mode.
## Changes
- Factor out the clamping code.
- Add another effect to handle 'isFloating' changes.
## Issue
4741: `Pop out player disappears or is cut off`
## Approach:
- When dragging stops, determine the location of the floating player with respect to the main window in terms of percentage.
- When window is resized, roughly re-position based on the stored percentage.
## Issue
4669: `Download doesn't trigger on web until 2nd attempt`
The issue only happens when _Autoplay_ is disabled in the User Settings and the video hasn't been loaded when _Download_ is clicked.
The following code:
`if (didClickDownloadButton && streamingUrl)`
didn't triggered because:
1. `streamingUrl` has not resolved yet when the Effect ran.
2. When it did resolve, the parent component was also notified and unmounted things, causing `didClickDownloadButton` to reset.
## Approach
Avoid the unnecessary unmounting by not using a conditional section wrapper within a return statement. React probably couldn't do the diffs when the conditional is at a section level.
## Issue
4708: Bring back tag list in side bar when Tags view selected
## Approach
- Instead of displaying either Channels or Tags, both will now be displayed.
- The tags will simply be a the same button component as the "channels", but with a "#" prefix. This simplifies the CSS-side changes, and looks better overall as well.
## Issue
Fixes 4709 `Dragging floating player via video section pauses video`
## Changes
Don't propagate the key-up action if the window was dragged. Hopefully there isn't another sub-component that relies on the action being propagated.
## Note
If you drag at exactly the "Play" icon the control bar, the issue still happens.
## Issue
Users are annoyed with the constant reset of the 'channel' setting in the Publish page.
## Changes
1. Revert the previous attempt in ff7b4092. The `usePersistedState` method is bad, as it will clash with the Redux value.
2. Implemented the persistence in Redux -- requires "https://github.com/lbryio/lbry-redux/pull/347".
