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I'm creating a long and detailed (historical) border, and I guess it will take days.

How can I weld lines, or just resume creating a new one directly from the end of old fragment using QGIS?

When I click 'edit' and that small '+' at the end it just adds one(why?) segment and then stops without me right clicking it.

Edit: I've found 'Advanced Line Editor' plugin, but still it doesn't connect lines/vertices, however splitting works.

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    Welcome to GIS SE! As a new user please take the tour to learn about our format. Please edit your question to include the GIS software you are using, and some info about your method for adding the new data. – Midavalo Dec 18 '18 at 21:16
  • I've assumed that you are using ArcMap so that I can provide an answer. If you are using something else, then please ask about that in a new question. – PolyGeo Dec 18 '18 at 21:47
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I think you are using QGIS 3.x because you mentioned the small +. If you want to extend the line you need to click inside the red circle node and move slightly your pointer (mouse) to become square shape so that it will enable you to extend the line:

  • Put the mouse over the node, it will become a big red circle

enter image description here

  • Click inside the big red circle and move your pointer (mouse) a little (almost one pixel) until it becomes pink square:

enter image description here

  • The pink square means that the node is selected and you can directly move the node to extend the line:

enter image description here

However, using the + sign make it easy to add a new line snapped to the existing line, which enables you to extend the line in same/different directions:

enter image description here

and it is still one line not two lines:

enter image description here

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I think the tool you are looking for to "resume creating a new one directly from the end of old fragment " is Continue Features, and that is described in the Help page titled Extending a line by sketching:

You can extend a line by digitizing new segments at the end of the existing sketch. For example, you might use this when updating a road by tracing over aerial photographs. You can resume sketching the shape of an existing line from the last vertex and add the new length to the road segment.

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The "welding" feature you're looking for is available on the Advanced Digitizing Toolbar, with the "merge selected features" button. This feature will join together two or more features in the same layer.

The starting end vertices of the two lines must be identical, so turn on snapping and use the Vertex Tool to move one of the the vertices onto the other.

Select both lines, and click the "merge selected features" button.

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Ok I figured it out.

@ahmadhanb: Yes, I'm using QGIS 3.4. I'm clicking it, but it doesn't turn pink, don't know what I'm doing wrong

cks@ "Merge Selected Features" is (was) always grayed out, I was selecting vertexes, they're turning blue, but that button doesn't worked

..until

I clicked Select Feature by area. Now it works :-)

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