Overriding blueprint template does not take effect until restart

[adrianlopezroche]

Overriding a blueprint's template does not take effect without restarting the development server.

Follow these steps to reproduce:

• First, add and register the following blueprint without creating any templates. It should produce a "Template Not Found" error:

from flask import Blueprint, render_template

blueprint = Blueprint(
    'blueprint', 
    __name__, 
    template_folder='blueprint/templates')

@blueprint.route('/testoverride')
def TestOverride():
    return render_template('test.html')

• Next, add a new template called "test.html" under the blueprint's template directory and refresh the page. It should find the template without restarting the server.
• Now add a second template having the same filename but different content under the application's template directory and refresh the page. The page's content will not change without restarting the server.
• Restart the server and refresh the page. Confirm the content has now changed.

[mitsuhiko]

This is tricky to do because of how the loaders work. For development purposes I would recommend disabling the template cache until this is properly fixed.